The solution of the equation $1 + a + {a^2} + {a^3} + ....... + {a^x}$ $ = (1 + a)(1 + {a^2})(1 + {a^4})$ is given by $x$ is equal to

  • A

    $3$

  • B

    $5$

  • C

    $7$

  • D

    None of these

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